Robotic Multi-Jet Coating for Glass Tube Inner Surfaces
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Solution Overview
Problem
Uniformly coating the inner surface of lengthy circular glass tubes with thin film photocatalysts remains a challenge using conventional dip coat methods.
Innovation Solution
A robotic multi-jet system comprising a robot with a spray section, a drier section, and a catalyst section, equipped with multiple jets and a warm air blower, which moves along the tube's inner surface to apply and dry a uniform photocatalyst layer, ensuring thorough coverage and adherence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Manufacturing precision
If conventional dip coat method is used, then the process is simple, but uniform coating on inner surface of lengthy tubes cannot be achieved
Solution Approach 1:
The coating system is segmented into multiple functional modules: a spray module with multiple jets for coating application, a drying module with blowers for solvent evaporation, and a propulsion module for tube advancement. Each module operates independently to achieve uniform coating through coordinated action, resolving the contradiction between coating precision and system complexity.
Solution Approach 2:
The invention transitions from conventional dip coating (single-point contact) to multi-jet spray coating (distributed multi-point contact) along the tube's inner surface. Multiple jets arranged circumferentially and axially create uniform coating by depositing material from multiple dimensions simultaneously, achieving precision that single-point methods cannot provide.
2Manufacturing precision
If multiple jets are used for uniform coating, then coating quality improves, but device complexity increases
Solution Approach 1:
Each jet module serves multiple functions: coating deposition, pattern formation, and uniformity control. The same multi-jet configuration is used throughout the coating zone to maintain consistent coating quality. This multi-functionality reduces the need for additional specialized components, managing complexity while maintaining precision.
Solution Approach 2:
The system employs dynamic coordination between tube propulsion speed, jet spray rates, and drying blower speeds. This dynamic adjustment ensures that coating uniformity is maintained despite variations in tube length and position, allowing the use of multiple jets without proportionally increasing overall system complexity.
3Manufacturing precision
If the system moves along the tube inner surface, then coverage is improved, but control difficulty increases
Solution Approach 1:
The propulsion system uses feedback control to maintain constant tube advancement speed through the coating and drying zones. Sensors monitor position and speed, adjusting motor output to ensure uniform exposure time for all tube sections. This feedback mechanism simplifies operation by automatically compensating for speed variations, making long-tube processing as controllable as short-tube processing.
Solution Approach 2:
The system maintains continuous tube propulsion through the entire coating and drying process without stopping or reversing. This continuous motion ensures uniform coating deposition and drying across the entire tube length, eliminating the need for complex positioning adjustments and simplifying operational control while achieving complete coverage.
4Manufacturing precision
If photocatalyst is sprayed in uniform layer, then coating quality improves, but material consumption increases
Solution Approach 1:
The system uses pneumatic spray jets to atomize and distribute photocatalyst solution uniformly across the tube inner surface. The controlled gas flow ensures even material distribution without excessive spray volume, reducing photocatalyst consumption while maintaining uniform coating quality compared to conventional dipping methods.
Solution Approach 2:
The spray parameters (pressure, flow rate, jet distance) are optimized to achieve minimum uniform coating thickness. By precisely controlling these parameters, the system deposits only the necessary amount of photocatalyst material required for uniform coverage, minimizing waste while ensuring coating quality.
Applied Scientific Principles
This section explains which scientific principles are used to turn an abstract innovation direction into a practical engineering solution.
Function Achieved in This Case
The system achieves a uniform thin film photocatalyst coating on the inner surface of glass tubes, enhancing the tube's properties while maintaining the photocatalyst's integrity and effectiveness.
Implementation Method 1
The photocatalyst tank contains a submersible pump. A first jet extension is fluidly connected to the photocatalyst tank through the submersible pump and is configured to spray a uniform layer of a photocatalyst
Implementation Method 2
spray a uniform layer of a photocatalyst contained in the photocatalyst tank through a first set of jets
Implementation Method 3
Thin film coating is a process of depositing a coating material in the form of a thin film onto a substrate material
Implementation Method 4
The drier section includes a blower, preferably a warm gas (e.g., air) blower... configured to spray a gas onto an inner surface of a tube
Implementation Method 5
a blower, preferably a warm gas (e.g., air) blower
Data Source
AI summary
The system includes a robot multi jet system having a spray section, a drier section, and a catalyst section. The drier section includes a warm air blower, the catalyst section includes a photocatalyst tank, and the spray section includes a plurality of jet extensions. A first jet extension connected to the photocatalyst tank sprays a uniform layer of a photocatalyst through a first set of jets, and a second jet extension that is mechanically connected to the drier section and in fluid communication with the warm air blower is configured to spray a gas onto an inner surface of the glass tube with a second set of jets. Both the drier section and the catalyst section are mounted on wheels to move the system on the inner surface of the glass tube. A motor is electrically connected to a battery mounted within the robot and mounted to the wheels.